Uploading is making a copy in digital format and be forever changed. Unless the original is actually destroyed in the process then the original would also be changed. Consciousness would not be lost but changed. The real question would be, is the digital copy real or simulated and does that matter?

Teleportation is different because it's disassembling and reassembling. We have no idea how consciousness works at our current level of technology. So, is consciousness something that can be transferred physically or is it metaphysical or is it a little of both? What happens to the original?